Possible QSPI flash chips more than 16MB?

Po Ting

Po Ting

Well-known member
Hello community and good morning :

Still working on my persistence of vision project with a new 160HD and T4.1 version (https://forum.pjrc.com/index.php?threads/posted-venti-pov-v2-0-80hd.53088/#post-361041)
it's almost done with SDcard/sdio version, just a bit slower frame rate at ~1600 per second
meanwhile I did a quick test with some winbond 16MB chips and MTP/little FS workaround, it gives 2900 FPS which is enough even if I extend to 240HD or more impractical length😂😂😂
the last thing is 16MB a bit too small if I have a full performance to build, I tried soldered 2 chips on back but seemly only 1 was detected

So... Anyone had a good candidate or application for QSPI/flash chip on back side of T4.1?
or anyone tried to chain like 10 chips on my design and still get QSPI speed? 🤔🤔🤔🤔
I've seen other bigger flash chips but I don't think they fit under the T4.1 pads (https://forum.pjrc.com/index.php?threads/smd-flash-with-teensy-4-1-design.77679/)
and hard to hand solder
 
Yes I mean flash, but flash for otherwise file MTP usage not used for program.

I mean physically, I am using Teensy 4.1 and it's back side pad on backside with a winbond 128Mbit chip,
trying to replace/compete with my SDIO version( using the SD slot on Teensy 4.1), both were very fast but QSPI gives a faster speed
I'm not familiar with flash chips and have roughly no experience other than using libraries and modules
I don't know what is other available usage (probably flexSPI or SPI port)
I'm assuming QSPI (with flash chip) is the answer, as compared to SD with SPI was way too slow for POV projects,
not sure with flash with SPI though

so physically a flash chip fits on the 8 pads with same package, with bigger storage volume and not slower speed,
and was supported with littleFS and QSPI was what I was looking for

but if someone have some experience using parallel SPI/ DMA/ some physic hacks to get more storage while nearly same speed as QSPI,
that was also a solution for me

Thanks
 
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